[add] max macro

include/freertos+/utils.h

@@ -7,6 +7,11 @@
                 __typeof__ (b) _b = (b); \
                 _a < _b ? _a : _b; } )
 
+#define max( a, b ) \
+            ( { __typeof__ (a) _a = (a); \
+	            __typeof__ (b) _b = (b); \
+	            _a > _b ? _a : _b; } )
+
 /* Unsigned ceiling function */
 #define uceil(X) ( ( X-(uint32_t)( X ) ) > 0 ? (uint32_t)( X+1 ) : (uint32_t)( X ) )